What is message authentication
Explain what is meant by the term message authentication? Describe the classes of message authentication function.
Expert
It is defines as a procedure which verifies if the received message comes from the assigned source has not been changed.
Classes of message authentication function are as considered as:
a) Message encryption : The whole cipher text could be used for the purpose of authentication.
b) Message Authentication Code : It is defined as a function of the message and secret key generate a fixed length value.
c) Hash function : This function maps the message of any length to the fixed length that serves as the authentication.
Explain the term Security Requirements and Attacks in network security.
Write an Idea for programming project to simulate a network attack or threat mechanism or a defense mechanism. Encipher message by using a keyword; Q : Purpose of State array State the State the purpose of State array?
State the purpose of State array?
Explain how the S-box is constructed?
Specify the four categories of security threats?
Explain the term internal and external error control.
Explain the term Caesar cipher.
Specify any cryptographic keys which are used in PGP?
Specify the services which are offered by the PGP services?
Explain the term Kerberos.
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